Jotsum is a calculator you write in plain words. Type your math and notes on the left; the answers appear on the right, live, as you type — no equals key, no buttons, no fuss.
It’s the everyday calculations you actually do: splitting a bill, converting currencies at today’s rate, working out a percentage off, adding up a trip budget, or checking how many days until a deadline. Name your values and reuse them down the page, and Jotsum keeps the whole sheet in sync.
SYNCS WITH YOUR MAC
Your calculations sync over iCloud, so the sheet you start on your Mac is on your iPhone — and the other way around. No account, no sign-in; it uses your own iCloud.
WHAT IT DOES
• Plain-language math with variables — name a number, reuse it anywhere
• Live currency conversion (160+ currencies + Bitcoin/Ethereum, no API key, no login)
• Units — length, mass, time, volume, data, temperature, area, speed
• Percentages done the human way — “20% off 80”, “12 is what % of 60”
• Dates & durations — “3 days + 5 hours”, “days until christmas”, time zones
• Scientific functions — sqrt, sin/cos/tan, logs, exp, powers, plus pi, e, tau
• Finance — compound interest and mortgage payments
• Multiple notes, organised in a tidy list
PRIVATE BY DESIGN
Everything stays on your devices and your own iCloud. No account, no analytics, no tracking. Currency rates are the only network request, and the app works offline too.
Light and dark, with a warm editorial look that’s easy on the eyes all day.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
Alerts. Write EUR in USD alert > 1.10 on any line and Jotsum tells you when the rate crosses your number. Part of Jotsum Pro.
Note history. Every note keeps its earlier versions. Open History to see what the numbers were and restore one. Part of Jotsum Pro.
Notes that read each other. Keep rent in a note called Constants and write Constants.rent anywhere else.
Quick Calc on the Mac. Press Option Space in any app for a floating scratch pad.
Also: a faint one-month line next to rates and stocks, hold a total to see how it splits, notes in Spotlight search, 10 AAPL now works, more currency names and symbols, and safer sync between devices.
Version 1.6
The developer, Hrvoje Matosic, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More